Antisiphoning refill tube



Feb. 26, 1946. B. svlRsKY ANTISIPHONING REFILL TUBE v original Filed Feb. 1e. 1942 A... v wnk Ressued Feb. 26, 1946 Re,

UNITED STATES PATENT OFFICE ANTISIPHONING REFILL TUBE Bennett Svirsky, Glendale, Calif.

Original No. 2,302,274, dated November 17, 1942,

Serial No. 446,726, June 12, 1942, which is a division of Serial No. 431,017, February 16, 1942. Application for reissue July 14, 1943, Serial No.

Claims.

This invention relates to an anti-siphoning refill tube.

This application is a division of the disclosure made in my copending application for patent on water control for closet tanks, Serial No. 431,017; led Feb. 16, 1942, which issued as Patent No. 2,299,707 on October 20, 1942.

Among the objects of the present invention are:

To provide, for a toilet storage tank and ball cock fixture combination, an improved independent means for preventing yback-Siphoning'of the water in the storage tank through the refill tube or the ball cock valve structure into the main flooroi the tank by means of the gasket washer I2. Into the annular recess IIT located in the discharge end of the pipe Il is sweated the contracted lower end of the tubular valve cup I3, the outer diameter of said cup above said contraction being the same as that of the pipe II and the upper part of said cup being externally screwthreaded and having screwed thereonto the tubular cap structure I4.

The valve cup I3 is provided with a threaded inlet port I5 in the transversely extending bottom portion thereof in axial alinement with the pipe II and into said port is screwed a tubular screw I5, by means of which the valve seat gasket washer I'I is secured to the bottom of the cup.

supply line containing the latter; to provide a In the wall of the cup I3 at a point slightly spaced more compact and more easily made structure for above its point of sweating onto the pipe II is the purpose just stated, and a structure the body arranged a circumferentially spaced series of portion of which consists only of parts which may radially extending passages I8. be formed as a unitary casting; and to reduce The cap structure I4 at a point adjacent its the number and simplify the character of the threaded union with the cup I3 is outwardly liquid conducting passages and ports required to bulged thereby providing a semi-circularly carry out the purposes of the invention. shaped, circumferential passageway I9 into Other objects, ladvantages and features of inwhich the water discharges from the passages IB vention will hereinafter appear. and below said passageway said bulge terminates Referring to the drawing wherein is shown a in a downwardly directed skirt 20 the inner preferred embodiment of the invention as now periphery of which is slightly spaced away from reduced to practice: the external periphery of the pipe II thereby Fig. 1 is a cross section of a toilet tank showing providing an annular channel 2l through which the installed device in a position for flushing. the water ows from the passageway I9 into the Fig. 2 is an enlarged view partly in side eleva- 30V tank. tion and partly in vertical midsecton of the ball The upper part of the cap structure I4 is diacock structure per se shown in Fig. 1, some pormetrically contracted to form an axial tubular tions being broken away in order to contract the extension 22 and also to form a downwardly facview. c ing annular shoulder 23 which overhangs the Fig. 3 is a transverse section taken on line 3-3 35 space surrounded by the upper end of the valve of Fig. 2, a portion 0f the refill tube being cup I3. Within sail valve cap is mounted a included in the VieW- vertically slidable plunger valve 25, the upper yReferring in detail to the briefly described part, of which has a, working fit; Within the tubw views, the toilet tank 4 contains a body of water lar Cap extension 22 The 10Wer portion of the 5 which is discharged thlllgh the Xtllre 5 in a 40 plunger valve 25 which remains within the valve direction indicated by the arrow when the valve cup |3 during the operation of the device has a 1 is Operated by meafns 0f a Corlvemfonal trip diametrically enlarged part 26 which forms -an lever through the medium of the hit s m the We annular extension or broad circumferential rib known manner' Anl overow pipe 9 connects 45 therearound, this enlarged part having a cylin- Wth the xfure ait a' lower level than tpe seat of drical face that has a working fit within the valve egtagetgeaeldtg ,llgugf tlag lpp cup I3. During the operation of the device the mouth of said tube being located preferably above enlarged part 2E always lemams above the pm" the highest level of the body of water-1n the tank Sages "L together with the body portion thereof, as will be The lower @Pd 0f the plunger alVe 25 h as a presently more fully described central concavity 2l and around said concavity a A pressure source' of water supply Acornmunibevel 28, thuS DIOVdng a definite Circular edge cates with the ltank 4, it being connected to the for contacting with the valve washer I'I when the inlet pipe Il and the latter pipe sealed with the valve closes. The concave recess 21 extends into the end of the plunger a sufficient distance safely in the tank without noise.

to clear the head of the tubular screw I6 when the plunger valveis inv the seated position.

At one side, on a level with its annular channel I9, the tubular structure |4 isfurnished with a lateral extension 3|. A horizontally directedpassage 32 extends from the channel I9 into s aid extension 3|, this passage having a contracted outlet port v33 leading laterally from its outer end portion' to discharge the water horizontally across an anti-siphoning gap 34 into a larger, horizontal passage 35 with which said outlet 33 isin axial alinement. Said port 33 extends horizontally, that is to say its axislies in a horizontal-plane. With the opposite end of said passage 35 communicates the rell tube I0.' The intake portion of said reilll tube is in axial alinement with the stream issuing from said contracted outlet 33 and is substantially straight for a suflicient distance from its intake extremity to avoid materially impeding said stream. Y i

The top vof the overflow pipe 9 is positioned inthe tank at a lower level than the cap structure |4 and therefore the entire capstructure, as .well as the intake and'. delivery ends of the refill tube which leads horizontally therefrom, is.

maintained at all times above the Water level.

The upper part oi the tubular cap structure is provided with conventional oppositely disposed extensions 4| and 42 to which are respectively pivoted the float rod 43 and lever 44, the pivoted portions of said rod and lever being bifurcated so'as to straddle the upper portions of said two extensions. The rod structure 43 carries a oat 45 onone end and at its opposite end has bifurcations between which is pivoted .the antifriction roller 46 which normally rests upon the Iree end of the lever 44. A regulating'scre'w 4l, carried by the mid-length portion of t said lever 44 has its headed end directed upwardly and itslower end normally resting upon the top of the plunger valve 25.

Around the inlet pipe Il isloosely iitted a buoyant body 5| which rises and fallswith Athe Water level and its upper surface vis always in the path of said downward stream. The force of this stream may slightly submerge said body at times. Said buoyant body will always function to cause said downward streamof water to merge in a noiseless manner with the body .of water in the tank.

In Vthe operation oI the device the toilet tank 4 is flushed in the well known manner, at vwhich time the valve controlling oat means 45 drops as -the body of water 5 in said tank is emptied through the discharge tting 6. .As-the. globular float 45 `starts to vfall the inlet means controlled bythe plunger isimmediately opened and water from the supply pipe Il starts iQWing through the radial passages I8 into'the passageway I3 and through thepannular channel 2| into the tank. As the water leaves the annular channel 2| it is directed against the annular buoyant body 5| during the time the tank is emptying. andwhile the filling the annular oat risesI always maintaining a buoyant position, so that the water falling thereagainst will merge with the water As a portion of 'the water flows through the channel 2| into the tank, other parts of the stream are directed through the lateral extension 3| through the reduced passage 33, squirts across the gap 34 'into the terminal passage or port 3i andtlience passes through the straight portion of tubelt andnnallyinto the overflow pim 3.4m' Ime :purpose orzsupplginmin' anemofrom the preceding detailed nomical manner the required amount of water the conventional toilet trap below the tank. It

. larger passage 35, a drill may be inserted through the latterpassage to drill-the port to the predetermined size desired. 'I'he passage sections 32, .33 and 35 combine 'to form a horizontal L-shaped passageY which may be conveniently included within `a single castinghaving the lateral extension shown in Fig. 3 furnished with the vertical groove 34- which forms the required air gap. The air'gap 34, at all times isolated from flowing liquid except that issuing from port 33, prevents water at any time from4 being siphoned through the rell .tube into the main supplyline. The angular shaped passage 32, 33 and 35 is arranged in such a relation to the casting of which it forms a part, as to require only a short radial casing extension 3| to contain all portions of said three part passage, including the air gap 34 between the passage sections 33 and 35. This structure also vmakes it possible to use a longer intake portion for the rell tube which bridges the distance between the inlet pipe and the overflow pipe 9.

The operation of the remaining structure, not

description.

It vshould be understood that the present disclosureis for thepurpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the subject matter claimed.

What is claimed is: Y

1. In an anti-.siphoning device Aof the kind described, a casting mountable upon the discharge portion of an upstandingsupply pipe for a toilet tank, said casting having a. lateral extension. there being an L- shaped horizontally extending passage withinsaidz-extension of said casting, one limb of said L-shaped passagereceiving a kportion of the stream delivered from said casting and Athe other or outer limb thereof, having across it an air gap formed by a recess or groove-which extends transversely ofthe extension oi' the casting wherein the passage is formed, the part of said outer limb-which is 0n the-intake side of said air gap being ci less vdiameter and axially in line with the remaining part of said outer limb,vand

,l speciically alluded to, will be readily understood a refill tubeinommunication with the outer'partof vsaid outer 2. In an anti-siphoning device of the kind described, a casting mountable uponthe discharge portion of an upstanding supply pipe for a toileti tank -above ythelevel of water in said tank, said casting having a. lateral extension thereon, an

cr outer'limb 'thereof having across it an air gap formed by a recess or groove which extends ,transyersely of theextension wherein the passageis formed and divides the, latter limb 'into an inner section and an outer section, said inner section beingfaxlallxinline'with the-outer` section. and a refill tubetnfcommunication .with the .ol'lter'pift or samffouteraectiod saidlair-cap-constructed and mamen-mnent@ isolated now except such as issues from the inner section of said divided passage.

3. In an anti-siphoning device, a casting mountable upon the discharge portion of ari-upstanding supply pipe for a toilet tank above the level of water in said tank, said casting having a lateral extension thereon, a horizontally extending passage contained within said extension. said passage having an inner portion and an outer portion forming a continuation of said inner portion, said inner portion of Said passage communicating with the casting for receiving a portion of the liquid delivered therefrom and said outer portion thereof having across it an air gap intermediate its ends, the part of the passage of said outer portion which is on the intake side of said air gap being more restricted in area than the remaining part of said outer portion of said passage, and a refill tube in communication with the end of said outer `portion of said passage remote from the air gap, said air gap constructed and arranged to be at all times'isolated from liquid flow except such as issues from said more restricted passage.

4. An anti-siphoning device comprising a casing adapted to be mounted upon the vertical intake pipe of a iiush tank and having a lateral extension thereon, a horizontally extending passage within said extension, said passage comprising an inner portion and an outer portion extending laterally irom said inner portion, said inner portion communicating with the casing for receiving a portion of the liquid delivered therefrom and said outer portion being interrupted by an air gap intermediate its ends whereby said outer portion is divided into an inner section and an outer section, the inner section being restricted in area with respect to the outer section, and a refill tube in communication with the end oi' said outer section remote from the air gap.

5. The subject matter oi' claim 4, and the intake portion of said refill tube being in axial alinement with the stream issuing from said restricted inner section, and substantially straight for a suiiicient distance from its intake extremity to avoid materially impeding said stream.

BENNETT SVIRSKY. 

